围岩对井间电磁测井的影响  

Influence of neighboring rock on cased crosswell electromagnetic logging

作　　者：于新娟[1,2,3] 刘迪仁[1,2] 蔡明[1,2] 虞兵[1,2] 许巍[1,2] 郑占树[1,2] 

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学),湖北荆州434023 [2]长江大学地球物理与石油资源学院,湖北荆州434023 [3]大庆油田有限责任公司钻探工程公司地质录井一公司,黑龙江大庆163411

出　　处：《石油地球物理勘探》2011年第4期654-656,667+499-500,共3页Oil Geophysical Prospecting

基　　金：国家自然科学基金(40727001);国家大学生创新性实验项目(A091048917)资助

摘　　要：本文以电磁场理论为基础,基于非均质套管井井间低频电磁场,建立包括井眼泥浆、套管、水泥环、围岩、目的地层等的非均质套管井井间模型,采用有限元方法分析围岩对井间电磁测井的影响。结果表明,在低频电磁场情况下,目的层厚度越薄,围岩的影响越大;围岩电阻率越低,电动势变化越大。该数值模拟分析结果可为井间电磁测井中围岩校正提供一定的理论参考。On the basis of electromagnetic field theory,this paper first builds the heterogeneous casing cross-well model including borehole,casing,cement sheath,neighboring rock and targets in a condition of the heterogeneous casing cross-well low-frequency electromagnetic field,and then analyzes the effect of neighboring rock on cross-well electromagnetic logging(CWEML) by finite element method.The result shows that the effect of neighboring rock is bigger as the target stratum is thinner;and the change of electromotive force is larger when neighboring rock resistivity(Rs<Rt)is lower.These numerical results are helpful for correction of the effect of neighboring rock in CWEML.

关 键 词：套管井 井间电磁测井 低频电磁场 围岩 

分 类 号：P631[天文地球—地质矿产勘探]